Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 17844:8847586c9037
8016302: Change type of the number of GC workers to unsigned int (2)
Reviewed-by: tschatzl, jwilhelm
| author | vkempik |
|---|---|
| date | Thu, 03 Apr 2014 17:49:31 +0400 |
| parents | ae7336d6337e |
| children | 78bbf4d43a14 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
| 28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 29 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 30 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 31 #include "memory/allocation.hpp" | |
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32 #include "memory/padded.inline.hpp" |
| 1972 | 33 #include "memory/space.inline.hpp" |
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34 #include "oops/oop.inline.hpp" |
| 1972 | 35 #include "utilities/bitMap.inline.hpp" |
| 36 #include "utilities/globalDefinitions.hpp" | |
| 12080 | 37 #include "utilities/growableArray.hpp" |
| 342 | 38 |
| 6197 | 39 class PerRegionTable: public CHeapObj<mtGC> { |
| 342 | 40 friend class OtherRegionsTable; |
| 41 friend class HeapRegionRemSetIterator; | |
| 42 | |
| 43 HeapRegion* _hr; | |
| 44 BitMap _bm; | |
| 45 jint _occupied; | |
| 46 | |
| 6253 | 47 // next pointer for free/allocated 'all' list |
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48 PerRegionTable* _next; |
| 342 | 49 |
| 6253 | 50 // prev pointer for the allocated 'all' list |
| 51 PerRegionTable* _prev; | |
| 342 | 52 |
| 6253 | 53 // next pointer in collision list |
| 54 PerRegionTable * _collision_list_next; | |
| 342 | 55 |
| 6253 | 56 // Global free list of PRTs |
| 57 static PerRegionTable* _free_list; | |
| 342 | 58 |
| 59 protected: | |
| 60 // We need access in order to union things into the base table. | |
| 61 BitMap* bm() { return &_bm; } | |
| 62 | |
| 63 void recount_occupied() { | |
| 64 _occupied = (jint) bm()->count_one_bits(); | |
| 65 } | |
| 66 | |
| 67 PerRegionTable(HeapRegion* hr) : | |
| 68 _hr(hr), | |
| 69 _occupied(0), | |
| 6253 | 70 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */), |
| 71 _collision_list_next(NULL), _next(NULL), _prev(NULL) | |
| 342 | 72 {} |
| 73 | |
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74 void add_card_work(CardIdx_t from_card, bool par) { |
| 342 | 75 if (!_bm.at(from_card)) { |
| 76 if (par) { | |
| 77 if (_bm.par_at_put(from_card, 1)) { | |
| 78 Atomic::inc(&_occupied); | |
| 79 } | |
| 80 } else { | |
| 81 _bm.at_put(from_card, 1); | |
| 82 _occupied++; | |
| 83 } | |
| 84 } | |
| 85 } | |
| 86 | |
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87 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
| 342 | 88 // Must make this robust in case "from" is not in "_hr", because of |
| 89 // concurrency. | |
| 90 | |
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91 if (G1TraceHeapRegionRememberedSet) { |
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92 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", |
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93 from, |
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94 UseCompressedOops |
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95 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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96 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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97 } |
| 342 | 98 |
| 99 HeapRegion* loc_hr = hr(); | |
| 100 // If the test below fails, then this table was reused concurrently | |
| 101 // with this operation. This is OK, since the old table was coarsened, | |
| 102 // and adding a bit to the new table is never incorrect. | |
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103 // If the table used to belong to a continues humongous region and is |
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104 // now reused for the corresponding start humongous region, we need to |
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105 // make sure that we detect this. Thus, we call is_in_reserved_raw() |
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106 // instead of just is_in_reserved() here. |
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107 if (loc_hr->is_in_reserved_raw(from)) { |
| 342 | 108 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
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109 CardIdx_t from_card = (CardIdx_t) |
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110 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
| 342 | 111 |
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112 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, |
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113 "Must be in range."); |
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114 add_card_work(from_card, par); |
| 342 | 115 } |
| 116 } | |
| 117 | |
| 118 public: | |
| 119 | |
| 120 HeapRegion* hr() const { return _hr; } | |
| 121 | |
| 122 jint occupied() const { | |
| 123 // Overkill, but if we ever need it... | |
| 124 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
| 125 return _occupied; | |
| 126 } | |
| 127 | |
| 6253 | 128 void init(HeapRegion* hr, bool clear_links_to_all_list) { |
| 129 if (clear_links_to_all_list) { | |
| 130 set_next(NULL); | |
| 131 set_prev(NULL); | |
| 132 } | |
| 342 | 133 _hr = hr; |
| 6253 | 134 _collision_list_next = NULL; |
| 342 | 135 _occupied = 0; |
| 136 _bm.clear(); | |
| 137 } | |
| 138 | |
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139 void add_reference(OopOrNarrowOopStar from) { |
| 342 | 140 add_reference_work(from, /*parallel*/ true); |
| 141 } | |
| 142 | |
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143 void seq_add_reference(OopOrNarrowOopStar from) { |
| 342 | 144 add_reference_work(from, /*parallel*/ false); |
| 145 } | |
| 146 | |
| 147 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
| 148 HeapWord* hr_bot = hr()->bottom(); | |
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149 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
| 342 | 150 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
| 151 recount_occupied(); | |
| 152 } | |
| 153 | |
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154 void add_card(CardIdx_t from_card_index) { |
| 342 | 155 add_card_work(from_card_index, /*parallel*/ true); |
| 156 } | |
| 157 | |
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158 void seq_add_card(CardIdx_t from_card_index) { |
| 342 | 159 add_card_work(from_card_index, /*parallel*/ false); |
| 160 } | |
| 161 | |
| 162 // (Destructively) union the bitmap of the current table into the given | |
| 163 // bitmap (which is assumed to be of the same size.) | |
| 164 void union_bitmap_into(BitMap* bm) { | |
| 165 bm->set_union(_bm); | |
| 166 } | |
| 167 | |
| 168 // Mem size in bytes. | |
| 169 size_t mem_size() const { | |
| 170 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
| 171 } | |
| 172 | |
| 173 // Requires "from" to be in "hr()". | |
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174 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 175 assert(hr()->is_in_reserved(from), "Precondition."); |
| 176 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
| 177 CardTableModRefBS::card_size); | |
| 178 return _bm.at(card_ind); | |
| 179 } | |
| 180 | |
| 6253 | 181 // Bulk-free the PRTs from prt to last, assumes that they are |
| 182 // linked together using their _next field. | |
| 183 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { | |
| 342 | 184 while (true) { |
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185 PerRegionTable* fl = _free_list; |
| 6253 | 186 last->set_next(fl); |
| 187 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
| 188 if (res == fl) { | |
| 189 return; | |
| 190 } | |
| 342 | 191 } |
| 192 ShouldNotReachHere(); | |
| 193 } | |
| 194 | |
| 6253 | 195 static void free(PerRegionTable* prt) { |
| 196 bulk_free(prt, prt); | |
| 197 } | |
| 198 | |
| 199 // Returns an initialized PerRegionTable instance. | |
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200 static PerRegionTable* alloc(HeapRegion* hr) { |
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201 PerRegionTable* fl = _free_list; |
| 342 | 202 while (fl != NULL) { |
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203 PerRegionTable* nxt = fl->next(); |
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204 PerRegionTable* res = |
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205 (PerRegionTable*) |
| 342 | 206 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
| 207 if (res == fl) { | |
| 6253 | 208 fl->init(hr, true); |
| 342 | 209 return fl; |
| 210 } else { | |
| 211 fl = _free_list; | |
| 212 } | |
| 213 } | |
| 214 assert(fl == NULL, "Loop condition."); | |
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215 return new PerRegionTable(hr); |
| 342 | 216 } |
| 217 | |
| 6253 | 218 PerRegionTable* next() const { return _next; } |
| 219 void set_next(PerRegionTable* next) { _next = next; } | |
| 220 PerRegionTable* prev() const { return _prev; } | |
| 221 void set_prev(PerRegionTable* prev) { _prev = prev; } | |
| 222 | |
| 223 // Accessor and Modification routines for the pointer for the | |
| 224 // singly linked collision list that links the PRTs within the | |
| 225 // OtherRegionsTable::_fine_grain_regions hash table. | |
| 226 // | |
| 227 // It might be useful to also make the collision list doubly linked | |
| 228 // to avoid iteration over the collisions list during scrubbing/deletion. | |
| 229 // OTOH there might not be many collisions. | |
| 230 | |
| 231 PerRegionTable* collision_list_next() const { | |
| 232 return _collision_list_next; | |
| 233 } | |
| 234 | |
| 235 void set_collision_list_next(PerRegionTable* next) { | |
| 236 _collision_list_next = next; | |
| 237 } | |
| 238 | |
| 239 PerRegionTable** collision_list_next_addr() { | |
| 240 return &_collision_list_next; | |
| 241 } | |
| 242 | |
| 342 | 243 static size_t fl_mem_size() { |
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244 PerRegionTable* cur = _free_list; |
| 342 | 245 size_t res = 0; |
| 246 while (cur != NULL) { | |
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247 res += cur->mem_size(); |
| 342 | 248 cur = cur->next(); |
| 249 } | |
| 250 return res; | |
| 251 } | |
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252 |
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253 static void test_fl_mem_size(); |
| 342 | 254 }; |
| 255 | |
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256 PerRegionTable* PerRegionTable::_free_list = NULL; |
| 342 | 257 |
| 258 size_t OtherRegionsTable::_max_fine_entries = 0; | |
| 259 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
| 260 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
| 261 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
| 262 | |
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263 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr, Mutex* m) : |
| 342 | 264 _g1h(G1CollectedHeap::heap()), |
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265 _hr(hr), _m(m), |
| 342 | 266 _coarse_map(G1CollectedHeap::heap()->max_regions(), |
| 267 false /* in-resource-area */), | |
| 268 _fine_grain_regions(NULL), | |
| 6253 | 269 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), |
| 342 | 270 _n_fine_entries(0), _n_coarse_entries(0), |
| 271 _fine_eviction_start(0), | |
| 272 _sparse_table(hr) | |
| 273 { | |
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274 typedef PerRegionTable* PerRegionTablePtr; |
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275 |
| 342 | 276 if (_max_fine_entries == 0) { |
| 277 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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278 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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279 _max_fine_entries = (size_t)1 << max_entries_log; |
| 342 | 280 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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281 |
| 342 | 282 assert(_fine_eviction_sample_size == 0 |
| 283 && _fine_eviction_stride == 0, "All init at same time."); | |
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284 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
| 342 | 285 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
| 286 } | |
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287 |
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288 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries, |
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289 mtGC, 0, AllocFailStrategy::RETURN_NULL); |
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290 |
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291 if (_fine_grain_regions == NULL) { |
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292 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, |
| 342 | 293 "Failed to allocate _fine_grain_entries."); |
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294 } |
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295 |
| 342 | 296 for (size_t i = 0; i < _max_fine_entries; i++) { |
| 297 _fine_grain_regions[i] = NULL; | |
| 298 } | |
| 299 } | |
| 300 | |
| 6253 | 301 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
| 302 // We always append to the beginning of the list for convenience; | |
| 303 // the order of entries in this list does not matter. | |
| 304 if (_first_all_fine_prts != NULL) { | |
| 305 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
| 306 _first_all_fine_prts->set_prev(prt); | |
| 307 prt->set_next(_first_all_fine_prts); | |
| 308 } else { | |
| 309 // this is the first element we insert. Adjust the "last" pointer | |
| 310 _last_all_fine_prts = prt; | |
| 311 assert(prt->next() == NULL, "just checking"); | |
| 312 } | |
| 313 // the new element is always the first element without a predecessor | |
| 314 prt->set_prev(NULL); | |
| 315 _first_all_fine_prts = prt; | |
| 316 | |
| 317 assert(prt->prev() == NULL, "just checking"); | |
| 318 assert(_first_all_fine_prts == prt, "just checking"); | |
| 319 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 320 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 321 "just checking"); | |
| 322 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 323 "just checking"); | |
| 324 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 325 "just checking"); | |
| 326 } | |
| 327 | |
| 328 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
| 329 if (prt->prev() != NULL) { | |
| 330 assert(_first_all_fine_prts != prt, "just checking"); | |
| 331 prt->prev()->set_next(prt->next()); | |
| 332 // removing the last element in the list? | |
| 333 if (_last_all_fine_prts == prt) { | |
| 334 _last_all_fine_prts = prt->prev(); | |
| 335 } | |
| 336 } else { | |
| 337 assert(_first_all_fine_prts == prt, "just checking"); | |
| 338 _first_all_fine_prts = prt->next(); | |
| 339 // list is empty now? | |
| 340 if (_first_all_fine_prts == NULL) { | |
| 341 _last_all_fine_prts = NULL; | |
| 342 } | |
| 343 } | |
| 344 | |
| 345 if (prt->next() != NULL) { | |
| 346 prt->next()->set_prev(prt->prev()); | |
| 347 } | |
| 348 | |
| 349 prt->set_next(NULL); | |
| 350 prt->set_prev(NULL); | |
| 351 | |
| 352 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 353 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 354 "just checking"); | |
| 355 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 356 "just checking"); | |
| 357 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 358 "just checking"); | |
| 359 } | |
| 360 | |
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361 int** FromCardCache::_cache = NULL; |
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362 uint FromCardCache::_max_regions = 0; |
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363 size_t FromCardCache::_static_mem_size = 0; |
| 342 | 364 |
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365 void FromCardCache::initialize(uint n_par_rs, uint max_num_regions) { |
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366 guarantee(_cache == NULL, "Should not call this multiple times"); |
| 342 | 367 |
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368 _max_regions = max_num_regions; |
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369 _cache = Padded2DArray<int, mtGC>::create_unfreeable(n_par_rs, |
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370 _max_regions, |
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371 &_static_mem_size); |
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372 |
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373 for (uint i = 0; i < n_par_rs; i++) { |
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374 for (uint j = 0; j < _max_regions; j++) { |
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375 set(i, j, InvalidCard); |
| 342 | 376 } |
| 377 } | |
| 378 } | |
| 379 | |
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380 void FromCardCache::shrink(uint new_num_regions) { |
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381 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
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382 assert(new_num_regions <= _max_regions, "Must be within max."); |
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383 for (uint j = new_num_regions; j < _max_regions; j++) { |
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384 set(i, j, InvalidCard); |
| 342 | 385 } |
| 386 } | |
| 387 } | |
| 388 | |
| 389 #ifndef PRODUCT | |
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390 void FromCardCache::print(outputStream* out) { |
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391 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
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392 for (uint j = 0; j < _max_regions; j++) { |
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393 out->print_cr("_from_card_cache["UINT32_FORMAT"]["UINT32_FORMAT"] = "INT32_FORMAT".", |
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394 i, j, at(i, j)); |
| 342 | 395 } |
| 396 } | |
| 397 } | |
| 398 #endif | |
| 399 | |
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400 void FromCardCache::clear(uint region_idx) { |
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401 uint num_par_remsets = HeapRegionRemSet::num_par_rem_sets(); |
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402 for (uint i = 0; i < num_par_remsets; i++) { |
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403 set(i, region_idx, InvalidCard); |
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404 } |
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405 } |
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406 |
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407 void OtherRegionsTable::init_from_card_cache(uint max_regions) { |
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408 FromCardCache::initialize(HeapRegionRemSet::num_par_rem_sets(), max_regions); |
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409 } |
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410 |
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411 void OtherRegionsTable::shrink_from_card_cache(uint new_num_regions) { |
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412 FromCardCache::shrink(new_num_regions); |
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413 } |
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414 |
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415 void OtherRegionsTable::print_from_card_cache() { |
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416 FromCardCache::print(); |
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417 } |
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418 |
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419 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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420 uint cur_hrs_ind = hr()->hrs_index(); |
| 342 | 421 |
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422 if (G1TraceHeapRegionRememberedSet) { |
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423 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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424 from, |
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425 UseCompressedOops |
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426 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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427 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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428 } |
| 342 | 429 |
| 430 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 431 | |
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432 if (G1TraceHeapRegionRememberedSet) { |
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433 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = "INT32_FORMAT")", |
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434 hr()->bottom(), from_card, |
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435 FromCardCache::at((uint)tid, cur_hrs_ind)); |
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436 } |
| 342 | 437 |
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438 if (FromCardCache::contains_or_replace((uint)tid, cur_hrs_ind, from_card)) { |
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439 if (G1TraceHeapRegionRememberedSet) { |
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440 gclog_or_tty->print_cr(" from-card cache hit."); |
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441 } |
| 342 | 442 assert(contains_reference(from), "We just added it!"); |
| 443 return; | |
| 444 } | |
| 445 | |
| 446 // Note that this may be a continued H region. | |
| 447 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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448 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
| 342 | 449 |
| 450 // If the region is already coarsened, return. | |
| 451 if (_coarse_map.at(from_hrs_ind)) { | |
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452 if (G1TraceHeapRegionRememberedSet) { |
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453 gclog_or_tty->print_cr(" coarse map hit."); |
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454 } |
| 342 | 455 assert(contains_reference(from), "We just added it!"); |
| 456 return; | |
| 457 } | |
| 458 | |
| 459 // Otherwise find a per-region table to add it to. | |
| 460 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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461 PerRegionTable* prt = find_region_table(ind, from_hr); |
| 342 | 462 if (prt == NULL) { |
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463 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); |
| 342 | 464 // Confirm that it's really not there... |
| 465 prt = find_region_table(ind, from_hr); | |
| 466 if (prt == NULL) { | |
| 467 | |
| 468 uintptr_t from_hr_bot_card_index = | |
| 469 uintptr_t(from_hr->bottom()) | |
| 470 >> CardTableModRefBS::card_shift; | |
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471 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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472 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
| 342 | 473 "Must be in range."); |
| 474 if (G1HRRSUseSparseTable && | |
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475 _sparse_table.add_card(from_hrs_ind, card_index)) { |
| 342 | 476 if (G1RecordHRRSOops) { |
| 477 HeapRegionRemSet::record(hr(), from); | |
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478 if (G1TraceHeapRegionRememberedSet) { |
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479 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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480 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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481 align_size_down(uintptr_t(from), |
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482 CardTableModRefBS::card_size), |
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483 hr()->bottom(), from); |
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484 } |
| 342 | 485 } |
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486 if (G1TraceHeapRegionRememberedSet) { |
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487 gclog_or_tty->print_cr(" added card to sparse table."); |
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488 } |
| 342 | 489 assert(contains_reference_locked(from), "We just added it!"); |
| 490 return; | |
| 491 } else { | |
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492 if (G1TraceHeapRegionRememberedSet) { |
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493 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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494 "overflow(f: %d, t: %d)", |
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495 tid, from_hrs_ind, cur_hrs_ind); |
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496 } |
| 342 | 497 } |
| 498 | |
| 499 if (_n_fine_entries == _max_fine_entries) { | |
| 500 prt = delete_region_table(); | |
| 6253 | 501 // There is no need to clear the links to the 'all' list here: |
| 502 // prt will be reused immediately, i.e. remain in the 'all' list. | |
| 503 prt->init(from_hr, false /* clear_links_to_all_list */); | |
| 342 | 504 } else { |
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505 prt = PerRegionTable::alloc(from_hr); |
| 6253 | 506 link_to_all(prt); |
| 342 | 507 } |
| 508 | |
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509 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
| 6253 | 510 prt->set_collision_list_next(first_prt); |
| 342 | 511 _fine_grain_regions[ind] = prt; |
| 512 _n_fine_entries++; | |
| 513 | |
| 514 if (G1HRRSUseSparseTable) { | |
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515 // Transfer from sparse to fine-grain. |
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516 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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517 assert(sprt_entry != NULL, "There should have been an entry"); |
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518 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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519 CardIdx_t c = sprt_entry->card(i); |
| 342 | 520 if (c != SparsePRTEntry::NullEntry) { |
| 521 prt->add_card(c); | |
| 522 } | |
| 523 } | |
| 524 // Now we can delete the sparse entry. | |
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525 bool res = _sparse_table.delete_entry(from_hrs_ind); |
| 342 | 526 assert(res, "It should have been there."); |
| 527 } | |
| 528 } | |
| 529 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
| 530 } | |
| 531 // Note that we can't assert "prt->hr() == from_hr", because of the | |
| 532 // possibility of concurrent reuse. But see head comment of | |
| 533 // OtherRegionsTable for why this is OK. | |
| 534 assert(prt != NULL, "Inv"); | |
| 535 | |
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536 prt->add_reference(from); |
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537 |
| 342 | 538 if (G1RecordHRRSOops) { |
| 539 HeapRegionRemSet::record(hr(), from); | |
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540 if (G1TraceHeapRegionRememberedSet) { |
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541 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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542 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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543 align_size_down(uintptr_t(from), |
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544 CardTableModRefBS::card_size), |
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545 hr()->bottom(), from); |
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546 } |
| 342 | 547 } |
| 548 assert(contains_reference(from), "We just added it!"); | |
| 549 } | |
| 550 | |
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551 PerRegionTable* |
| 342 | 552 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
| 553 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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554 PerRegionTable* prt = _fine_grain_regions[ind]; |
| 342 | 555 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 556 prt = prt->collision_list_next(); |
| 342 | 557 } |
| 558 // Loop postcondition is the method postcondition. | |
| 559 return prt; | |
| 560 } | |
| 561 | |
| 562 jint OtherRegionsTable::_n_coarsenings = 0; | |
| 563 | |
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564 PerRegionTable* OtherRegionsTable::delete_region_table() { |
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565 assert(_m->owned_by_self(), "Precondition"); |
| 342 | 566 assert(_n_fine_entries == _max_fine_entries, "Precondition"); |
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567 PerRegionTable* max = NULL; |
| 342 | 568 jint max_occ = 0; |
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569 PerRegionTable** max_prev; |
| 342 | 570 size_t max_ind; |
| 571 | |
| 572 size_t i = _fine_eviction_start; | |
| 573 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
| 574 size_t ii = i; | |
| 575 // Make sure we get a non-NULL sample. | |
| 576 while (_fine_grain_regions[ii] == NULL) { | |
| 577 ii++; | |
| 578 if (ii == _max_fine_entries) ii = 0; | |
| 579 guarantee(ii != i, "We must find one."); | |
| 580 } | |
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581 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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582 PerRegionTable* cur = *prev; |
| 342 | 583 while (cur != NULL) { |
| 584 jint cur_occ = cur->occupied(); | |
| 585 if (max == NULL || cur_occ > max_occ) { | |
| 586 max = cur; | |
| 587 max_prev = prev; | |
| 588 max_ind = i; | |
| 589 max_occ = cur_occ; | |
| 590 } | |
| 6253 | 591 prev = cur->collision_list_next_addr(); |
| 592 cur = cur->collision_list_next(); | |
| 342 | 593 } |
| 594 i = i + _fine_eviction_stride; | |
| 595 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
| 596 } | |
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597 |
| 342 | 598 _fine_eviction_start++; |
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599 |
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600 if (_fine_eviction_start >= _n_fine_entries) { |
| 342 | 601 _fine_eviction_start -= _n_fine_entries; |
| 602 } | |
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603 |
| 342 | 604 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
| 605 | |
| 606 // Set the corresponding coarse bit. | |
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607 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
| 342 | 608 if (!_coarse_map.at(max_hrs_index)) { |
| 609 _coarse_map.at_put(max_hrs_index, true); | |
| 610 _n_coarse_entries++; | |
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611 if (G1TraceHeapRegionRememberedSet) { |
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612 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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613 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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614 hr()->bottom(), |
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615 max->hr()->bottom(), |
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616 _n_coarse_entries); |
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617 } |
| 342 | 618 } |
| 619 | |
| 620 // Unsplice. | |
| 6253 | 621 *max_prev = max->collision_list_next(); |
| 342 | 622 Atomic::inc(&_n_coarsenings); |
| 623 _n_fine_entries--; | |
| 624 return max; | |
| 625 } | |
| 626 | |
| 627 | |
| 628 // At present, this must be called stop-world single-threaded. | |
| 629 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
| 630 BitMap* region_bm, BitMap* card_bm) { | |
| 631 // First eliminated garbage regions from the coarse map. | |
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632 if (G1RSScrubVerbose) { |
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633 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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634 } |
| 342 | 635 |
| 636 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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637 if (G1RSScrubVerbose) { |
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638 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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639 _n_coarse_entries); |
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640 } |
| 342 | 641 _coarse_map.set_intersection(*region_bm); |
| 642 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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643 if (G1RSScrubVerbose) { |
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644 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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645 } |
| 342 | 646 |
| 647 // Now do the fine-grained maps. | |
| 648 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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649 PerRegionTable* cur = _fine_grain_regions[i]; |
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650 PerRegionTable** prev = &_fine_grain_regions[i]; |
| 342 | 651 while (cur != NULL) { |
| 6253 | 652 PerRegionTable* nxt = cur->collision_list_next(); |
| 342 | 653 // If the entire region is dead, eliminate. |
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654 if (G1RSScrubVerbose) { |
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655 gclog_or_tty->print_cr(" For other region %u:", |
| 3766 | 656 cur->hr()->hrs_index()); |
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657 } |
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658 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
| 342 | 659 *prev = nxt; |
| 6253 | 660 cur->set_collision_list_next(NULL); |
| 342 | 661 _n_fine_entries--; |
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662 if (G1RSScrubVerbose) { |
| 342 | 663 gclog_or_tty->print_cr(" deleted via region map."); |
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664 } |
| 6253 | 665 unlink_from_all(cur); |
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666 PerRegionTable::free(cur); |
| 342 | 667 } else { |
| 668 // Do fine-grain elimination. | |
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669 if (G1RSScrubVerbose) { |
| 342 | 670 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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671 } |
| 342 | 672 cur->scrub(ctbs, card_bm); |
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673 if (G1RSScrubVerbose) { |
| 342 | 674 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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675 } |
| 342 | 676 // Did that empty the table completely? |
| 677 if (cur->occupied() == 0) { | |
| 678 *prev = nxt; | |
| 6253 | 679 cur->set_collision_list_next(NULL); |
| 342 | 680 _n_fine_entries--; |
| 6253 | 681 unlink_from_all(cur); |
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682 PerRegionTable::free(cur); |
| 342 | 683 } else { |
| 6253 | 684 prev = cur->collision_list_next_addr(); |
| 342 | 685 } |
| 686 } | |
| 687 cur = nxt; | |
| 688 } | |
| 689 } | |
| 690 // Since we may have deleted a from_card_cache entry from the RS, clear | |
| 691 // the FCC. | |
| 692 clear_fcc(); | |
| 693 } | |
| 694 | |
| 695 | |
| 696 size_t OtherRegionsTable::occupied() const { | |
| 697 size_t sum = occ_fine(); | |
| 698 sum += occ_sparse(); | |
| 699 sum += occ_coarse(); | |
| 700 return sum; | |
| 701 } | |
| 702 | |
| 703 size_t OtherRegionsTable::occ_fine() const { | |
| 704 size_t sum = 0; | |
| 6253 | 705 |
| 706 size_t num = 0; | |
| 707 PerRegionTable * cur = _first_all_fine_prts; | |
| 708 while (cur != NULL) { | |
| 709 sum += cur->occupied(); | |
| 710 cur = cur->next(); | |
| 711 num++; | |
| 342 | 712 } |
| 6253 | 713 guarantee(num == _n_fine_entries, "just checking"); |
| 342 | 714 return sum; |
| 715 } | |
| 716 | |
| 717 size_t OtherRegionsTable::occ_coarse() const { | |
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718 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
| 342 | 719 } |
| 720 | |
| 721 size_t OtherRegionsTable::occ_sparse() const { | |
| 722 return _sparse_table.occupied(); | |
| 723 } | |
| 724 | |
| 725 size_t OtherRegionsTable::mem_size() const { | |
| 726 size_t sum = 0; | |
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727 // all PRTs are of the same size so it is sufficient to query only one of them. |
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728 if (_first_all_fine_prts != NULL) { |
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729 assert(_last_all_fine_prts != NULL && |
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730 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); |
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731 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; |
| 342 | 732 } |
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733 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
| 342 | 734 sum += (_coarse_map.size_in_words() * HeapWordSize); |
| 735 sum += (_sparse_table.mem_size()); | |
| 736 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
| 737 return sum; | |
| 738 } | |
| 739 | |
| 740 size_t OtherRegionsTable::static_mem_size() { | |
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741 return FromCardCache::static_mem_size(); |
| 342 | 742 } |
| 743 | |
| 744 size_t OtherRegionsTable::fl_mem_size() { | |
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745 return PerRegionTable::fl_mem_size(); |
| 342 | 746 } |
| 747 | |
| 748 void OtherRegionsTable::clear_fcc() { | |
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749 FromCardCache::clear(hr()->hrs_index()); |
| 342 | 750 } |
| 751 | |
| 752 void OtherRegionsTable::clear() { | |
| 6253 | 753 // if there are no entries, skip this step |
| 754 if (_first_all_fine_prts != NULL) { | |
| 755 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
| 756 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
| 757 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
| 758 } else { | |
| 759 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
| 342 | 760 } |
| 6253 | 761 |
| 762 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
| 342 | 763 _sparse_table.clear(); |
| 764 _coarse_map.clear(); | |
| 765 _n_fine_entries = 0; | |
| 766 _n_coarse_entries = 0; | |
| 767 | |
| 768 clear_fcc(); | |
| 769 } | |
| 770 | |
| 771 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
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772 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); |
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773 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
| 342 | 774 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
| 775 if (del_single_region_table(ind, from_hr)) { | |
| 776 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
| 777 } else { | |
| 778 _coarse_map.par_at_put(hrs_ind, 0); | |
| 779 } | |
| 780 // Check to see if any of the fcc entries come from here. | |
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781 uint hr_ind = hr()->hrs_index(); |
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782 for (uint tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
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783 int fcc_ent = FromCardCache::at(tid, hr_ind); |
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784 if (fcc_ent != FromCardCache::InvalidCard) { |
| 342 | 785 HeapWord* card_addr = (HeapWord*) |
| 786 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
| 787 if (hr()->is_in_reserved(card_addr)) { | |
| 788 // Clear the from card cache. | |
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789 FromCardCache::set(tid, hr_ind, FromCardCache::InvalidCard); |
| 342 | 790 } |
| 791 } | |
| 792 } | |
| 793 } | |
| 794 | |
| 795 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
| 796 HeapRegion* hr) { | |
| 797 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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798 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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799 PerRegionTable* prt = *prev_addr; |
| 342 | 800 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 801 prev_addr = prt->collision_list_next_addr(); |
| 802 prt = prt->collision_list_next(); | |
| 342 | 803 } |
| 804 if (prt != NULL) { | |
| 805 assert(prt->hr() == hr, "Loop postcondition."); | |
| 6253 | 806 *prev_addr = prt->collision_list_next(); |
| 807 unlink_from_all(prt); | |
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808 PerRegionTable::free(prt); |
| 342 | 809 _n_fine_entries--; |
| 810 return true; | |
| 811 } else { | |
| 812 return false; | |
| 813 } | |
| 814 } | |
| 815 | |
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816 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 817 // Cast away const in this case. |
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818 MutexLockerEx x((Mutex*)_m, Mutex::_no_safepoint_check_flag); |
| 342 | 819 return contains_reference_locked(from); |
| 820 } | |
| 821 | |
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822 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
| 342 | 823 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
| 824 if (hr == NULL) return false; | |
|
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825 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
| 342 | 826 // Is this region in the coarse map? |
| 827 if (_coarse_map.at(hr_ind)) return true; | |
| 828 | |
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829 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
| 342 | 830 hr); |
| 831 if (prt != NULL) { | |
| 832 return prt->contains_reference(from); | |
| 833 | |
| 834 } else { | |
| 835 uintptr_t from_card = | |
| 836 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 837 uintptr_t hr_bot_card_index = | |
| 838 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
| 839 assert(from_card >= hr_bot_card_index, "Inv"); | |
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840 CardIdx_t card_index = from_card - hr_bot_card_index; |
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841 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
|
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842 "Must be in range."); |
|
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843 return _sparse_table.contains_card(hr_ind, card_index); |
| 342 | 844 } |
| 845 } | |
| 846 | |
| 2173 | 847 void |
| 848 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 849 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
| 850 } | |
| 851 | |
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852 // Determines how many threads can add records to an rset in parallel. |
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853 // This can be done by either mutator threads together with the |
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854 // concurrent refinement threads or GC threads. |
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855 uint HeapRegionRemSet::num_par_rem_sets() { |
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856 return MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), (uint)ParallelGCThreads); |
| 342 | 857 } |
| 858 | |
| 859 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 860 HeapRegion* hr) | |
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861 : _bosa(bosa), |
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862 _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #"UINT32_FORMAT, hr->hrs_index()), true), |
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863 _code_roots(), _other_regions(hr, &_m) { |
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864 reset_for_par_iteration(); |
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865 } |
| 342 | 866 |
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867 void HeapRegionRemSet::setup_remset_size() { |
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868 // Setup sparse and fine-grain tables sizes. |
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869 // table_size = base * (log(region_size / 1M) + 1) |
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870 const int LOG_M = 20; |
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871 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
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872 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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873 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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874 } |
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875 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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876 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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877 } |
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878 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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879 } |
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880 |
| 342 | 881 bool HeapRegionRemSet::claim_iter() { |
| 882 if (_iter_state != Unclaimed) return false; | |
| 883 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
| 884 return (res == Unclaimed); | |
| 885 } | |
| 886 | |
| 887 void HeapRegionRemSet::set_iter_complete() { | |
| 888 _iter_state = Complete; | |
| 889 } | |
| 890 | |
| 891 bool HeapRegionRemSet::iter_is_complete() { | |
| 892 return _iter_state == Complete; | |
| 893 } | |
| 894 | |
| 895 #ifndef PRODUCT | |
|
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896 void HeapRegionRemSet::print() { |
|
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897 HeapRegionRemSetIterator iter(this); |
| 342 | 898 size_t card_index; |
| 899 while (iter.has_next(card_index)) { | |
| 900 HeapWord* card_start = | |
| 901 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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902 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
| 342 | 903 } |
| 904 if (iter.n_yielded() != occupied()) { | |
| 905 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
| 906 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
| 907 iter.n_yielded(), | |
| 908 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
| 909 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
| 910 occupied(), occ_coarse(), occ_fine()); | |
| 911 } | |
| 912 guarantee(iter.n_yielded() == occupied(), | |
| 913 "We should have yielded all the represented cards."); | |
| 914 } | |
| 915 #endif | |
| 916 | |
| 917 void HeapRegionRemSet::cleanup() { | |
| 918 SparsePRT::cleanup_all(); | |
| 919 } | |
| 920 | |
| 921 void HeapRegionRemSet::clear() { | |
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922 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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923 clear_locked(); |
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924 } |
| 12080 | 925 |
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926 void HeapRegionRemSet::clear_locked() { |
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927 _code_roots.clear(); |
| 342 | 928 _other_regions.clear(); |
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929 assert(occupied_locked() == 0, "Should be clear."); |
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930 reset_for_par_iteration(); |
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931 } |
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932 |
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933 void HeapRegionRemSet::reset_for_par_iteration() { |
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934 _iter_state = Unclaimed; |
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935 _iter_claimed = 0; |
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936 // It's good to check this to make sure that the two methods are in sync. |
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937 assert(verify_ready_for_par_iteration(), "post-condition"); |
| 342 | 938 } |
| 939 | |
| 940 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
| 941 BitMap* region_bm, BitMap* card_bm) { | |
| 942 _other_regions.scrub(ctbs, region_bm, card_bm); | |
| 943 } | |
| 944 | |
| 12080 | 945 // Code roots support |
| 946 | |
| 947 void HeapRegionRemSet::add_strong_code_root(nmethod* nm) { | |
| 948 assert(nm != NULL, "sanity"); | |
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949 _code_roots.add(nm); |
| 12080 | 950 } |
| 951 | |
| 952 void HeapRegionRemSet::remove_strong_code_root(nmethod* nm) { | |
| 953 assert(nm != NULL, "sanity"); | |
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954 _code_roots.remove(nm); |
| 12080 | 955 // Check that there were no duplicates |
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956 guarantee(!_code_roots.contains(nm), "duplicate entry found"); |
| 12080 | 957 } |
| 958 | |
| 959 class NMethodMigrationOopClosure : public OopClosure { | |
| 960 G1CollectedHeap* _g1h; | |
| 961 HeapRegion* _from; | |
| 962 nmethod* _nm; | |
| 963 | |
| 964 uint _num_self_forwarded; | |
| 965 | |
| 966 template <class T> void do_oop_work(T* p) { | |
| 967 T heap_oop = oopDesc::load_heap_oop(p); | |
| 968 if (!oopDesc::is_null(heap_oop)) { | |
| 969 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 970 if (_from->is_in(obj)) { | |
| 971 // Reference still points into the source region. | |
| 972 // Since roots are immediately evacuated this means that | |
| 973 // we must have self forwarded the object | |
| 974 assert(obj->is_forwarded(), | |
| 975 err_msg("code roots should be immediately evacuated. " | |
| 976 "Ref: "PTR_FORMAT", " | |
| 977 "Obj: "PTR_FORMAT", " | |
| 978 "Region: "HR_FORMAT, | |
| 979 p, (void*) obj, HR_FORMAT_PARAMS(_from))); | |
| 980 assert(obj->forwardee() == obj, | |
| 981 err_msg("not self forwarded? obj = "PTR_FORMAT, (void*)obj)); | |
| 982 | |
| 983 // The object has been self forwarded. | |
| 984 // Note, if we're during an initial mark pause, there is | |
| 985 // no need to explicitly mark object. It will be marked | |
| 986 // during the regular evacuation failure handling code. | |
| 987 _num_self_forwarded++; | |
| 988 } else { | |
| 989 // The reference points into a promotion or to-space region | |
| 990 HeapRegion* to = _g1h->heap_region_containing(obj); | |
| 991 to->rem_set()->add_strong_code_root(_nm); | |
| 992 } | |
| 993 } | |
| 994 } | |
| 995 | |
| 996 public: | |
| 997 NMethodMigrationOopClosure(G1CollectedHeap* g1h, HeapRegion* from, nmethod* nm): | |
| 998 _g1h(g1h), _from(from), _nm(nm), _num_self_forwarded(0) {} | |
| 999 | |
| 1000 void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 1001 void do_oop(oop* p) { do_oop_work(p); } | |
| 1002 | |
| 1003 uint retain() { return _num_self_forwarded > 0; } | |
| 1004 }; | |
| 1005 | |
| 1006 void HeapRegionRemSet::migrate_strong_code_roots() { | |
| 1007 assert(hr()->in_collection_set(), "only collection set regions"); | |
|
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1008 assert(!hr()->isHumongous(), |
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1009 err_msg("humongous region "HR_FORMAT" should not have been added to the collection set", |
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1010 HR_FORMAT_PARAMS(hr()))); |
| 12080 | 1011 |
| 1012 ResourceMark rm; | |
| 1013 | |
| 1014 // List of code blobs to retain for this region | |
| 1015 GrowableArray<nmethod*> to_be_retained(10); | |
| 1016 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1017 | |
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1018 while (!_code_roots.is_empty()) { |
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1019 nmethod *nm = _code_roots.pop(); |
| 12080 | 1020 if (nm != NULL) { |
| 1021 NMethodMigrationOopClosure oop_cl(g1h, hr(), nm); | |
| 1022 nm->oops_do(&oop_cl); | |
| 1023 if (oop_cl.retain()) { | |
| 1024 to_be_retained.push(nm); | |
| 1025 } | |
| 1026 } | |
| 1027 } | |
| 1028 | |
| 1029 // Now push any code roots we need to retain | |
| 1030 assert(to_be_retained.is_empty() || hr()->evacuation_failed(), | |
| 1031 "Retained nmethod list must be empty or " | |
| 1032 "evacuation of this region failed"); | |
| 1033 | |
| 1034 while (to_be_retained.is_nonempty()) { | |
| 1035 nmethod* nm = to_be_retained.pop(); | |
| 1036 assert(nm != NULL, "sanity"); | |
| 1037 add_strong_code_root(nm); | |
| 1038 } | |
| 1039 } | |
| 1040 | |
| 1041 void HeapRegionRemSet::strong_code_roots_do(CodeBlobClosure* blk) const { | |
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1042 _code_roots.nmethods_do(blk); |
| 12080 | 1043 } |
| 1044 | |
| 1045 size_t HeapRegionRemSet::strong_code_roots_mem_size() { | |
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1046 return _code_roots.mem_size(); |
| 12080 | 1047 } |
| 1048 | |
| 342 | 1049 //-------------------- Iteration -------------------- |
| 1050 | |
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1051 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(HeapRegionRemSet* hrrs) : |
|
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1052 _hrrs(hrrs), |
| 342 | 1053 _g1h(G1CollectedHeap::heap()), |
|
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1054 _coarse_map(&hrrs->_other_regions._coarse_map), |
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1055 _fine_grain_regions(hrrs->_other_regions._fine_grain_regions), |
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1056 _bosa(hrrs->bosa()), |
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1057 _is(Sparse), |
| 342 | 1058 // Set these values so that we increment to the first region. |
|
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1059 _coarse_cur_region_index(-1), |
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1060 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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1061 _cur_region_cur_card(0), |
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1062 _fine_array_index(-1), |
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1063 _fine_cur_prt(NULL), |
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1064 _n_yielded_coarse(0), |
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1065 _n_yielded_fine(0), |
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1066 _n_yielded_sparse(0), |
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1067 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
| 342 | 1068 |
| 1069 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
| 1070 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
| 1071 // Go to the next card. | |
| 1072 _coarse_cur_region_cur_card++; | |
| 1073 // Was the last the last card in the current region? | |
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1074 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
| 342 | 1075 // Yes: find the next region. This may leave _coarse_cur_region_index |
| 1076 // Set to the last index, in which case there are no more coarse | |
| 1077 // regions. | |
| 1078 _coarse_cur_region_index = | |
| 1079 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
| 1080 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
| 1081 _coarse_cur_region_cur_card = 0; | |
| 1082 HeapWord* r_bot = | |
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1083 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
| 342 | 1084 _cur_region_card_offset = _bosa->index_for(r_bot); |
| 1085 } else { | |
| 1086 return false; | |
| 1087 } | |
| 1088 } | |
| 1089 // If we didn't return false above, then we can yield a card. | |
| 1090 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
| 1091 return true; | |
| 1092 } | |
| 1093 | |
| 1094 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
| 1095 // Otherwise, find the next bucket list in the array. | |
| 1096 _fine_array_index++; | |
| 1097 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
| 1098 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
| 1099 if (_fine_cur_prt != NULL) return; | |
| 1100 else _fine_array_index++; | |
| 1101 } | |
| 1102 assert(_fine_cur_prt == NULL, "Loop post"); | |
| 1103 } | |
| 1104 | |
| 1105 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
| 1106 if (fine_has_next()) { | |
| 1107 _cur_region_cur_card = | |
| 1108 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
| 1109 } | |
| 1110 while (!fine_has_next()) { | |
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1111 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
| 342 | 1112 _cur_region_cur_card = 0; |
| 6253 | 1113 _fine_cur_prt = _fine_cur_prt->collision_list_next(); |
| 342 | 1114 } |
| 1115 if (_fine_cur_prt == NULL) { | |
| 1116 fine_find_next_non_null_prt(); | |
| 1117 if (_fine_cur_prt == NULL) return false; | |
| 1118 } | |
| 1119 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
| 1120 "inv."); | |
| 1121 HeapWord* r_bot = | |
| 1122 _fine_cur_prt->hr()->bottom(); | |
| 1123 _cur_region_card_offset = _bosa->index_for(r_bot); | |
| 1124 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
| 1125 } | |
| 1126 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
| 1127 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
| 1128 return true; | |
| 1129 } | |
| 1130 | |
| 1131 bool HeapRegionRemSetIterator::fine_has_next() { | |
| 1132 return | |
| 1133 _fine_cur_prt != NULL && | |
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1134 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
| 342 | 1135 } |
| 1136 | |
| 1137 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
| 1138 switch (_is) { | |
| 1139 case Sparse: | |
| 1140 if (_sparse_iter.has_next(card_index)) { | |
| 1141 _n_yielded_sparse++; | |
| 1142 return true; | |
| 1143 } | |
| 1144 // Otherwise, deliberate fall-through | |
| 1145 _is = Fine; | |
| 1146 case Fine: | |
| 1147 if (fine_has_next(card_index)) { | |
| 1148 _n_yielded_fine++; | |
| 1149 return true; | |
| 1150 } | |
| 1151 // Otherwise, deliberate fall-through | |
| 1152 _is = Coarse; | |
| 1153 case Coarse: | |
| 1154 if (coarse_has_next(card_index)) { | |
| 1155 _n_yielded_coarse++; | |
| 1156 return true; | |
| 1157 } | |
| 1158 // Otherwise... | |
| 1159 break; | |
| 1160 } | |
| 1161 assert(ParallelGCThreads > 1 || | |
| 1162 n_yielded() == _hrrs->occupied(), | |
| 1163 "Should have yielded all the cards in the rem set " | |
| 1164 "(in the non-par case)."); | |
| 1165 return false; | |
| 1166 } | |
| 1167 | |
| 1168 | |
| 1169 | |
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1170 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1171 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1172 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1173 int HeapRegionRemSet::_n_recorded = 0; |
| 342 | 1174 |
| 1175 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
| 1176 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
| 1177 int HeapRegionRemSet::_n_recorded_events = 0; | |
| 1178 | |
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1179 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
| 342 | 1180 if (_recorded_oops == NULL) { |
| 1181 assert(_n_recorded == 0 | |
| 1182 && _recorded_cards == NULL | |
| 1183 && _recorded_regions == NULL, | |
| 1184 "Inv"); | |
| 6197 | 1185 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
| 1186 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
| 1187 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
| 342 | 1188 } |
| 1189 if (_n_recorded == MaxRecorded) { | |
| 1190 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
| 1191 } else { | |
| 1192 _recorded_cards[_n_recorded] = | |
| 1193 (HeapWord*)align_size_down(uintptr_t(f), | |
| 1194 CardTableModRefBS::card_size); | |
| 1195 _recorded_oops[_n_recorded] = f; | |
| 1196 _recorded_regions[_n_recorded] = hr; | |
| 1197 _n_recorded++; | |
| 1198 } | |
| 1199 } | |
| 1200 | |
| 1201 void HeapRegionRemSet::record_event(Event evnt) { | |
| 1202 if (!G1RecordHRRSEvents) return; | |
| 1203 | |
| 1204 if (_recorded_events == NULL) { | |
| 1205 assert(_n_recorded_events == 0 | |
| 1206 && _recorded_event_index == NULL, | |
| 1207 "Inv"); | |
| 6197 | 1208 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
| 1209 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
| 342 | 1210 } |
| 1211 if (_n_recorded_events == MaxRecordedEvents) { | |
| 1212 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
| 1213 } else { | |
| 1214 _recorded_events[_n_recorded_events] = evnt; | |
| 1215 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
| 1216 _n_recorded_events++; | |
| 1217 } | |
| 1218 } | |
| 1219 | |
| 1220 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
| 1221 switch (evnt) { | |
| 1222 case Event_EvacStart: | |
| 1223 str->print("Evac Start"); | |
| 1224 break; | |
| 1225 case Event_EvacEnd: | |
| 1226 str->print("Evac End"); | |
| 1227 break; | |
| 1228 case Event_RSUpdateEnd: | |
| 1229 str->print("RS Update End"); | |
| 1230 break; | |
| 1231 } | |
| 1232 } | |
| 1233 | |
| 1234 void HeapRegionRemSet::print_recorded() { | |
| 1235 int cur_evnt = 0; | |
| 1236 Event cur_evnt_kind; | |
| 1237 int cur_evnt_ind = 0; | |
| 1238 if (_n_recorded_events > 0) { | |
| 1239 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1240 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1241 } | |
| 1242 | |
| 1243 for (int i = 0; i < _n_recorded; i++) { | |
| 1244 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
| 1245 gclog_or_tty->print("Event: "); | |
| 1246 print_event(gclog_or_tty, cur_evnt_kind); | |
| 1247 gclog_or_tty->print_cr(""); | |
| 1248 cur_evnt++; | |
| 1249 if (cur_evnt < MaxRecordedEvents) { | |
| 1250 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1251 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1252 } | |
| 1253 } | |
| 1254 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
| 1255 " for ref " PTR_FORMAT ".\n", | |
| 1256 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
| 1257 _recorded_oops[i]); | |
| 1258 } | |
| 1259 } | |
| 1260 | |
| 2173 | 1261 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
| 1262 SparsePRT::reset_for_cleanup_tasks(); | |
| 1263 } | |
| 1264 | |
| 1265 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1266 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
| 1267 } | |
| 1268 | |
| 1269 void | |
| 1270 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1271 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
| 1272 } | |
| 1273 | |
| 342 | 1274 #ifndef PRODUCT |
|
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1275 void PerRegionTable::test_fl_mem_size() { |
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1276 PerRegionTable* dummy = alloc(NULL); |
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1277 free(dummy); |
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1278 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size"); |
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1279 // try to reset the state |
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1280 _free_list = NULL; |
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1281 delete dummy; |
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1282 } |
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1283 |
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1284 void HeapRegionRemSet::test_prt() { |
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1285 PerRegionTable::test_fl_mem_size(); |
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1286 } |
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1287 |
| 342 | 1288 void HeapRegionRemSet::test() { |
| 1289 os::sleep(Thread::current(), (jlong)5000, false); | |
| 1290 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1291 | |
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1292 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
| 342 | 1293 // hash bucket. |
| 1294 HeapRegion* hr0 = g1h->region_at(0); | |
| 1295 HeapRegion* hr1 = g1h->region_at(1); | |
| 1296 HeapRegion* hr2 = g1h->region_at(5); | |
| 1297 HeapRegion* hr3 = g1h->region_at(6); | |
| 1298 HeapRegion* hr4 = g1h->region_at(7); | |
| 1299 HeapRegion* hr5 = g1h->region_at(8); | |
| 1300 | |
| 1301 HeapWord* hr1_start = hr1->bottom(); | |
| 1302 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
| 1303 HeapWord* hr1_last = hr1->end() - 1; | |
| 1304 | |
| 1305 HeapWord* hr2_start = hr2->bottom(); | |
| 1306 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
| 1307 HeapWord* hr2_last = hr2->end() - 1; | |
| 1308 | |
| 1309 HeapWord* hr3_start = hr3->bottom(); | |
| 1310 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
| 1311 HeapWord* hr3_last = hr3->end() - 1; | |
| 1312 | |
| 1313 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
| 1314 | |
| 1315 // Make three references from region 0x101... | |
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1316 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1317 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1318 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
| 342 | 1319 |
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1320 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1321 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1322 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
| 342 | 1323 |
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1324 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1325 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1326 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
| 342 | 1327 |
| 1328 // Now cause a coarsening. | |
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1329 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1330 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
| 342 | 1331 |
| 1332 // Now, does iteration yield these three? | |
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1333 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 1334 size_t sum = 0; |
| 1335 size_t card_index; | |
| 1336 while (iter.has_next(card_index)) { | |
| 1337 HeapWord* card_start = | |
| 1338 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
| 1339 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
| 1340 sum++; | |
| 1341 } | |
| 1342 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
| 1343 guarantee(sum == hrrs->occupied(), "Failure"); | |
| 1344 } | |
| 1345 #endif |